//package com.sky.service.impl;
//
//
//import com.sky.context.BaseContext;
//import com.sky.dto.ShoppingCartDTO;
//import com.sky.entity.Dish;
//import com.sky.entity.Setmeal;
//import com.sky.entity.ShoppingCart;
//import com.sky.mapper.DishMapper;
//import com.sky.mapper.SetmealMapper;
//import com.sky.mapper.ShoppingCartMapper;
//import com.sky.service.ShoppingCartService;
//import org.springframework.beans.BeanUtils;
//import org.springframework.beans.factory.annotation.Autowired;
//import org.springframework.stereotype.Service;
//import java.time.LocalDateTime;
//import java.util.List;
//
//@Service
//public class ShoppingCartServiceImpl implements ShoppingCartService {
//
//    @Autowired
//    private ShoppingCartMapper shoppingCartMapper;
//    @Autowired
//    private DishMapper dishMapper;
//    @Autowired
//    private SetmealMapper setmealMapper;
//
//    /**
//     * 添加购物车
//     *
//     * @param shoppingCartDTO
//     */
//    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
//        ShoppingCart shoppingCart = new ShoppingCart();
//        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
//        //只能查询自己的购物车数据
//        shoppingCart.setUserId(BaseContext.getCurrentId());
//
//        //判断当前商品是否在购物车中
//        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
//
//        if (shoppingCartList != null && shoppingCartList.size()==1)                                                                                                                     {
//            //如果已经存在，就更新数量，数量加1
//             shoppingCart = shoppingCartList.get(0);
//            shoppingCart.setNumber(shoppingCart.getNumber() + 1);
//            shoppingCartMapper.updateNumberById(shoppingCart);
//        } else {
//            //如果不存在，插入数据，数量就是1
//
//            //判断当前添加到购物车的是菜品还是套餐
//            Long dishId = shoppingCartDTO.getDishId();
//            if (dishId != null) {
//                //添加到购物车的是菜品
//                Dish dish = dishMapper.getById(dishId);
//                shoppingCart.setName(dish.getName());
//                shoppingCart.setImage(dish.getImage());
//                shoppingCart.setAmount(dish.getPrice());
//            } else {
//                //添加到购物车的是套餐
//                Setmeal setmeal = setmealMapper.getById(shoppingCartDTO.getSetmealId());
//                shoppingCart.setName(setmeal.getName());
//                shoppingCart.setImage(setmeal.getImage());
//                shoppingCart.setAmount(setmeal.getPrice());
//            }
//            shoppingCart.setNumber(1);
//            shoppingCart.setCreateTime(LocalDateTime.now());
//            shoppingCartMapper.insert(shoppingCart);
//        }
//    }
//
//
//    /*
//   * 查看购物车
//   * */
//    public List<ShoppingCart> showShoppingCart() {
//        Long userId = BaseContext.getCurrentId();
//        ShoppingCart shoppingCart=ShoppingCart.builder()
//                .userId(userId)
//                .build();
//        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
//        return list;
//
//    }
//
//
//    /*
//    * 清空购物车
//    * */
//    public void clean() {
//        Long userId = BaseContext.getCurrentId();
//        shoppingCartMapper.deleteById(userId);
//
//
//    }
//
//
//    /*
//    * 删除购物车中的一个商品
//    * */
////    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
////        ShoppingCart shoppingCart = new ShoppingCart();
////        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
////        shoppingCart.setUserId(BaseContext.getCurrentId());
////
////        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
////
////        if (list!=null&&list.size()>0){
////             shoppingCart = list.get(0);
////            Integer number = shoppingCart.getNumber();
////            if (number==1){
////                //如果只有 一条记录 则直接删除
////                shoppingCartMapper.deleteById(shoppingCart.getId());
////            }
////            else {
////                shoppingCart.setNumber(shoppingCart.getNumber()-1);
////                shoppingCartMapper.updateNumberById(shoppingCart);
////            }
////
////        }
////    }
//}
package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.beans.beancontext.BeanContext;
import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断当前加入到购物车中的商品是否已经存在了
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        //如果已经存在了，只需要将数量加一
        if(list != null && list.size() > 0){
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1);//update shopping_cart set number = ? where id = ?
            shoppingCartMapper.updateNumberById(cart);
        }else {
            //如果不存在，需要插入一条购物车数据
            //判断本次添加到购物车的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if(dishId != null){
                //本次添加到购物车的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else{
                //本次添加到购物车的是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 查看购物车
     * @return
     */
    public List<ShoppingCart> showShoppingCart() {
        //获取到当前微信用户的id
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userId)
                .build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /**
     * 清空购物车
     */
    public void clean() {
        //获取到当前微信用户的id
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);
    }

    /**
     * 删除购物车中一个商品
     * @param shoppingCartDTO
     */
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //设置查询条件，查询当前登录用户的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if(list != null && list.size() > 0){
            shoppingCart = list.get(0);

            Integer number = shoppingCart.getNumber();
            if(number == 1){
                //当前商品在购物车中的份数为1，直接删除当前记录
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }else {
                //当前商品在购物车中的份数不为1，修改份数即可
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }
        }
    }
}
